Analog Modules
4-88
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Technical specifications of the SM 331; AI 8 x 16 bits
Dimensions and Weight
Dimensions W x H x D
(in millimeters)
40 x 125 x 117
Weight Approx. 272 g
Data for Specific Module
Supports clocked
operation
No
Number of inputs 8
Length of cable
• Shielded max. 200 m
Voltages, Currents, Potentials
Power rated voltage of the
electronics L+
24 VDC
• Reverse polarity protection Yes
Isolation
• Between channels and
backplane bus
Yes
• Between channels and
power supply of the
electronics
Yes
• Between the channels
In groups of
Yes
2
Permitted potential difference
• Between the inputs (ECM) 75 VDC / 60 VAC
• Between M
ANA
and
M
internal
(U
ISO
)
75 VDC / 60 VAC
Insulation tested with 500 VAC
Current consumption
• From the backplane bus max. 100 mA
• From the power supply L+ max. 200 mA
Power dissipation of the module typ. 3.0 W
Analog value generation
Measuring principle Integrating
Integration time/conversion
time/ resolution (per channel)
• Parameters can be
assigned
Yes
• Basic conversion time in
ms (8-channel mode)
95/83/72/23
• Basic conversion time in
ms (4-channel mode)
10
1)
• Resolution including sign 16 bits
• Noise suppression for
frequency f1
in Hz
All
2)
/50/60/400
Smoothing of the measured
values
None / low/
average/ high
Basic execution time of the
module, in ms
(8-channel-mode)
190/166/144//46
Basic execution time of the
module, in ms
(4-channel-mode)
10
1)
Suppression of interference, Limits of Error
Interference suppression for
F = n x (f1 ± 1%) (f1 = interference frequency, n = 1, 2,
...)
• Common-mode
interference (U
cm
< AC 60
V)
> 100 dB
• Series-mode interference
(peak value of interference
< rated value of input
range)
>90 dB
3)
Crosstalk between the inputs > 100 dB
Operational limit (in the entire temperature range, with
reference to the input range)
• Input voltage $0.1%
• Input current $0.1%
Basic error (operational limit at 25 °C, referred to input
range)
• Voltage input $0.05%
• Current input $0.05%
Temperature error (with
reference to the input range)
$0.005%/K
Linearity error (with reference to
the input range)
$0.01%
Repeatability (in steady state at
25 °C, referred to the input
range)
$0.01%
Status, interrupts, diagnostics
Interrupts
• Hardware interrupt if the
limit value is exceeded
Programmable
channels 0 – 7
• Hardware interrupt at end
of cycle
Parameters can be
assigned
• Diagnostic interrupt Parameters can be
assigned
Diagnostic functions Parameters can be
assigned
• Group error display Red LED (SF)
• Diagnostics information
read-out
Possible
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